期刊
ASTROPHYSICAL JOURNAL
卷 640, 期 1, 页码 L95-L98出版社
IOP PUBLISHING LTD
DOI: 10.1086/503101
关键词
Sun : interior; Sun : oscillations
We find evidence for an activity-dependent change in solar structure at the second helium ionization zone (similar to 0.98 R-circle dot). We use low-degree p-mode frequencies obtained from 13 years of observations by the Birmingham Solar Oscillations Network (BiSON) to track changes in the amplitude of the rapid-variation signature imposed by the bump in the adiabatic exponent, Gamma(1), at the He II ionization zone. This is the first indication of structural change detected using only low-degree data and confirms the recent results of high-degree and local helioseismic studies.
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